Attention, world: California just threw down the gauntlet on climate change. State lawmakers moved Tuesday to implement an ambitious plan to slash greenhouse gas emissions 80 percent below 1990 levels by 2025 to avert catastrophic climate change. A package of bills introduced by Democrats—who control the legislature, the governorship, and every statewide office—aims to cut petroleum use in half by 2030 and improve the energy efficiency of buildings 50 percent by that date. In 15 years, California would obtain half its electricity from renewable energy sources, such as solar and wind.